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GB/T 4325.19-2013: Methods for chemical analysis of molybdenum -- Part 19: Determination of chromium content -- Diphenylcarbazide spectrophotometry
Status: Valid GB/T 4325.19: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4325.19-2013 | English | 169 |
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Methods for chemical analysis of molybdenum -- Part 19: Determination of chromium content -- Diphenylcarbazide spectrophotometry
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GB/T 4325.19-2013
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| GB/T 4325.19-1984 | English | 199 |
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Methods for chemical analysis of molybdenum--The diantipyrylmethane photometric method for the determination of titanium content
| Obsolete |
GB/T 4325.19-1984
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PDF similar to GB/T 4325.19-2013
Basic data | Standard ID | GB/T 4325.19-2013 (GB/T4325.19-2013) | | Description (Translated English) | Methods for chemical analysis of molybdenum -- Part 19: Determination of chromium content -- Diphenylcarbazide spectrophotometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H63 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 7,769 | | Older Standard (superseded by this standard) | GB/T 4325.21-1984 | | Regulation (derived from) | National Standards Bulletin 2013 No. 6 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies: Mo Determination of the amount of chromium. This standard applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate in the determination of chromium content. Measurement range of 0. 00020% to 0. 015 %. | GB/T 4325.19-2013: Methods for chemical analysis of molybdenum -- Part 19: Determination of chromium content -- Diphenylcarbazide spectrophotometry
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Methods for chemical analysis of molybdenum Part 19... Determination of chromium content Diphenylcarbazide spectrophotometry
ICS 77.120.99
H63
National Standards of People's Republic of China
Replacing GB/T 4325.21-1984
Chemical analysis of molybdenum
Part 19. Determination of chromium content
Diphenyl carbon acid dihydrazide spectrophotometry
Part 19. Determinationofchromiumcontent-
Issued on. 2013-05-09
2014-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 4325 "chemical analysis of molybdenum" is divided into 26 parts.
--- Part 1. Determination of lead content - Graphite furnace atomic absorption spectrometry;
--- Part 2. Determination of cadmium content by flame atomic absorption spectrometry;
--- Part 3. Determination of bismuth content - atomic fluorescence spectrometry;
--- Part 4. Determination of tin content by atomic fluorescence spectrometry;
--- Part 5. Determination of antimony content - Atomic Fluorescence Spectrometry;
--- Part 6. Determination of arsenic content by atomic fluorescence spectrometry;
--- Part 7. Determination of the amount of iron phenanthroline spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 8. Determination of cobalt content of cobalt reagents spectrophotometry and flame atomic absorption spectrometry;
--- Part 9. Determination of the amount of nickel dimethylglyoxime spectrophotometric method and the flame atomic absorption spectrometry;
--- Part 10. Determination of copper content - Flame atomic absorption spectrometry;
--- Part 11. Determination of aluminum content of chromium azure S spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 12. silicon content - Inductively coupled plasma atomic emission spectrometry;
--- Part 13. Determination of calcium content by flame atomic absorption spectrometry;
--- Part 14. Determination of magnesium content - Flame atomic absorption spectrometry;
--- Part 15. Determination of sodium content by flame atomic absorption spectrometry;
--- Part 16. Determination of potassium content by flame atomic absorption spectrometry;
--- Part 17. Determination of titanium content of two methane antipyrine spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 18. Determination of the amount of vanadium tantalum reagent spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 19. Determination of chromium content of diphenyl carbon acid dihydrazide spectrophotometry;
--- Part 20. Determination of manganese content by flame atomic absorption spectrometry;
--- Part 21. Determination of the amount of carbon and sulfur content of the high-frequency combustion infrared absorption method;
--- Part 22. Determination of phosphorus content - Molybdenum blue spectrophotometric method;
--- Part 23. Determination of the oxygen and nitrogen inert gas fusion infrared absorption method - thermal conductivity method;
--- Part 24. Determination of tungsten content - Inductively coupled plasma atomic emission spectrometry;
--- Part 25. Determination of the amount of hydrogen in the inert gas fusion infrared absorption method/thermal conductivity method;
--- Part 26. aluminum, magnesium, calcium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, cadmium, tin, antimony, tungsten, lead and bismuth content - Inductively coupled
Co-Plasma Mass Spectrometry.
This section GB/T Part of 194,325.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB/T 4325.21-1984 "spectrophotometric determination of chemical analysis of molybdenum diphenyl carbon acid dihydrazide chromium content." This section
Compared with GB/T 4325.21-1984, main technical changes are as follows.
--- Increased repeatability terms;
--- Increasing the test report.
The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.
This section is drafted. Jinduicheng Molybdenum Industry Co., Ltd., Zhuzhou Cemented Carbide Group Limited.
The main drafters of this section. Chen Guohua, Yang Jinge, Ma Zhijun.
This part of the standard replaces the previous editions are.
--- GB/T 4325.21-1984.
Chemical analysis of molybdenum
Part 19. Determination of chromium content
Diphenyl carbon acid dihydrazide spectrophotometry
1 Scope
GB/T 4325 provisions of this part of the determination of the amount of chromium molybdenum.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate determination of chromium content. Determination range of 0.00020% to 0.015%.
2 Method summary
Samples with sulfuric acid, ammonium sulfate decomposed to beryllium hydroxide as a carrier in pH8 ~ 9 co-precipitation of chromium, and molybdenum separation. The precipitate was dissolved in sulfuric acid,
Plus two phenyl hydrazine with carbonyldiimidazole chromium complexes formed purple, absorbance was measured.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical reagents and secondary distilled water or equivalent purity.
3.1 ammonium sulfate (excellent pure).
Anhydrous sodium sulfite 3.2.
3.3 sulfate (ρ = 1.84g/mL).
3.4 sulfate (1mol/L).
3.5 ammonium hydroxide (ρ = 0.90g/mL), ultra-pure.
3.6 phosphate (11).
3.7 beryllium sulfate solution (20g/L).
3.8 potassium permanganate solution (3g/L).
3.9 sodium azide (50g/L). 5g sodium azide were dissolved in 100mL water.
3.10 bath. a solution of ammonium sulfate (10g/L), ammonium hydroxide (3.5) was basified to pH8 ~ 9.
3.11 diphenyl hydrazine acetone solution of carbonyldiimidazole (5g/L), with the preparation.
3.12 phenolphthalein ethanol solution (1g/L).
3.13 chromium standard stock solution. Weigh 0.2263g pre-drying at 140 ℃ ~ potassium dichromate 150 ℃, dissolved in water, the water moved
1000mL volumetric flask and dilute to volume, and mix. This solution 1mL containing 80μg chromium.
3.14 Chromium standard solution. Pipette 5.00mL chromium standard stock solution (3.13), placed in 100mL beaker, add 20mL water, 5mL sulfur
Acid (3.3), the number of tablets (approximately 3mg) of anhydrous sodium sulfite (3.2), boil rush sulfur dioxide, cooled and transferred to 200mL volumetric flask, dilute with water
Diluted to volume, and mix. This solution 1mL containing 2μg chromium.
4 Sample
Molybdenum should smash through the 0.75mm standard sieve.
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